[NullReferenceException: 未将对象引用设置到对象的实例。]
BoooMing.WebSystem.content.download.downloadx(String filename, String sourcename) in E:\fwm自动导入\交付20210824\BoooMing.WebSystem\content\download.aspx.cs:43
BoooMing.WebSystem.content.download.Page_Load(Object sender, EventArgs e) in E:\fwm自动导入\交付20210824\BoooMing.WebSystem\content\download.aspx.cs:38
System.Web.Util.CalliEventHandlerDelegateProxy.Callback(Object sender, EventArgs e) +51
System.Web.UI.Control.OnLoad(EventArgs e) +95
System.Web.UI.Control.LoadRecursive() +59
System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +678
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